摘要
研究民用飞机动力失效对飞机起飞阶段纵向气动特性的影响规律及其机理,对保证飞机有效操纵和安全飞行具有重要意义。采用在点对点多块结构化网格系统上求解三维可压缩雷诺平均N-S方程的数值方法,研究发动机动力失效对某民用飞机起飞构型纵向气动特性的影响。通过DLR-F11模型验证研究方法对民用飞机高升力构型气动特性的预测能力;针对安装动力短舱的某翼吊涡扇发动机民用飞机起飞构型,通过对比其发动机在正常工况和失效时飞机气动特性的差异,得出动力失效对飞机纵向气动特性的影响规律及机理。结果表明:动力失效后,不但溢流效应会使飞机阻力系数增大;还会导致发动机进、排气特性较正常工作状态明显不同,恶化短舱附近流场,对飞机的升力、失速特性带来不利影响。
It is important to study the influence and mechanism for longitudinal aerodynamic characteristics of a civil aircraft due to engine failure at takeoff stage.It is of important significance to ensure the effective operation and safe flight of the aircraft.Three-dimensional compressible RANS equations on a point-to-point multi-block structured grid are used to investigate the effects of engine failure on longitudinal aerodynamic characteristics of a civil aircraft take-off configuration.Firstly,the DLR-F11 standard model is computed to validate the reliability of the research method.Results show that the computational predictions agree well with the experiment results,so that the research method could be used to predict flow field of a complex civil transport aircraft configuration with high lift device.Secondly,the effects of engine failure on longitudinal aerodynamic characteristics of a civil transport aircraft are investigated.The results show that engine failure not only makes the drag coefficient increasing obviously,but also affects the lift coefficient,pitching moment and stall characteristics adversely.
出处
《航空工程进展》
CSCD
2016年第2期143-152,共10页
Advances in Aeronautical Science and Engineering
基金
国家自然科学基金(11302213)
关键词
数值模拟
发动机失效
高升力构型
进排气边界
纵向气动特性
numerical simulation
powered off
high lift configuration
intake/exhaust boundary condition
longitudinal aerodynamic characteristics
